WO2016150098A1

WO2016150098A1 - Pcie apparatus and pcie bus management method and device

Info

Publication number: WO2016150098A1
Application number: PCT/CN2015/088177
Authority: WO
Inventors: 蒋习旺
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-03-20
Filing date: 2015-08-26
Publication date: 2016-09-29
Also published as: CN106033399A; CN106033399B

Abstract

A latest peripheral component interconnect express (PCIe) apparatus and PCIe bus management method and device. The method comprises: scanning and enumerating a latest PCIe apparatus tree to obtain a scanned PCIe apparatus, generating, according to a location of the PCIe apparatus in a PCIe bus, a structure corresponding to the scanned PCIe apparatus (S102); adding the structure to a PCIe apparatus linked list (S104); managing a dynamic enumeration scan on the PCIe apparatus and the PCIe bus according to the linked list and a PCIe apparatus control file exported by a specified file system (S106), wherein the control file is used to indicate resource information of the PCIe apparatus. The present invention addresses the problem in the related art in which a PCIe initialization scan are all static, resulting in an increase in a system debugging efficiency.

Description

PCIe device and PCIe bus management method and device

Technical field

The present invention relates to the field of communications, and in particular to a method and apparatus for managing a PCIe device and a PCIe bus of the latest peripheral component expansion interface.

Background technique

The latest Peripheral Component Interconnect Express (PCIe) bus is a local bus in a computer system. It is similar to the PCI bus. Its main purpose is to connect the processor and external devices. Of course, the PCIe bus also Interconnection between multiple processors or interconnection between a processor and a device controller can be implemented. The implementation of the PCIe architecture is slightly different in different processor architectures. However, in most processor systems, the basic modules of RC, Switch, and PCIe-to-PCI bridges are used to connect PCIe and PCI devices.

PCIe initialization is usually in the firmware Fireware phase or the Linux system initialization phase. Its main job is to traverse all PCIe devices in the current processor system and initialize them. In the traversal process, the Depth First Search (DFS) algorithm is usually used to perform traversal search on the PCIe bus tree, and allocate the relevant bus number and address resource of the bus.

From a processor system perspective, the PCIe initialization mechanism in the Linux kernel is not perfect. It contains a lot of redundant code and extra steps. This affects the efficiency of Linux PCIe initialization. In addition, whether in the Fireware stage or the Linux boot stage, the PCIe initialization scan is static. After the system is powered on, only the PCIe bus tree is initialized and scanned. If you need to scan again, you must reload the Linux system. Of course, this approach is understandable, especially when the Linux operating system is in a stable application phase.

However, when the entire software/hardware system is in the development and verification phase, it is likely to involve the debugging of the functions and performance of some PCIe devices. After adjusting the PCIe device, if you need to rescan the PCIe device tree, you must reset the entire system and reload Linux. Although this method is feasible at the implementation level, it is very cumbersome at the operational level. For example, to debug the signal quality of an EP device hanging under the PCIe Switch, it is necessary to continuously modify the pre-emphasis and load balancing of the EP device through other buses (such as I2c). Re-power and reload the Linux system after each new parameter adjustment. Doing so will undoubtedly reduce the efficiency of debugging and increase the complexity of debugging.

The initialization scan of PCIe in the related art is a static problem, and an effective solution has not been proposed yet.

Summary of the invention

The main purpose of the embodiments of the present invention is to provide a PCIe device and a PCIe bus management method and apparatus, so as to at least solve the problem that the initialization scan of PCIe in the related art is static.

According to an aspect of an embodiment of the present invention, a method for managing a peripheral component expansion interface PCIe device and a PCIe bus is provided, including: performing an enumeration scan operation on a PCIe device tree of a latest peripheral component extension interface, and according to the PCIe The location of the device in the PCIe bus generates a structure corresponding to the scanned PCEe device; adding the structure to the linked list of the PCIe device; and exporting the PCIe device control file according to the linked list and the specified file system And managing the dynamic enumeration scan of the PCIe device and the PCIe bus, wherein the control file is used to indicate the PCIe device resource information.

Optionally, the managing the dynamic scanning of the PCIe device and the PCIe bus according to the linked list and the PCIe device control file exported by the specified file system comprises: the PCIe device file exported according to the linked list and the specified file system to the PCIe Performing a write operation on the bus for performing a dynamic enumeration scan on the PCIe bus; performing a read operation on the PCIe device according to the linked list and a PCIe device control file exported by the specified file system, for acquiring the PCIe device Resource information.

Optionally, before the dynamic scanning of the PCIe device and the PCIe bus is performed according to the linked list and the PCIe device control file exported by the specified file system, the method includes: when the specified file system is initialized, and Establishing a control file under the specified file system, wherein the control file is provided with a first function and a second function, where the first function is used to indicate how to operate the control file to complete dynamics on the PCIe bus Enumeration scan, the second function is for indicating a start position of performing an enumeration scan; performing a dynamic enumeration scan on the PCIe device bus according to the first function and the second function.

Optionally, performing an enumeration scan operation on the PCIe device tree includes performing an enumeration scan on the entire PCIe device tree from the PCIe controller according to a depth-first algorithm.

Optionally, before performing the enumeration scan operation on the PCIe device tree, the method includes: turning off an enumeration scan operation function carried by the self, and triggering an operation of performing an enumeration scan on the PCIe device tree according to the depth priority algorithm.

According to another aspect of the present invention, there is provided a management device for a recent peripheral component expansion interface PCIe device and a PCIe bus, comprising: an execution module configured to perform an enumeration scan operation on a PCIe device tree of a latest peripheral component extension interface And generating, according to the location of the PCIe device in the PCIe bus, a structure corresponding to the scanned PCEe device; adding a module, being configured to add the structure to a linked list of the PCIe device; and managing a module, And managing the dynamic enumeration scan of the PCIe device and the PCIe bus according to the linked list and the PCIe device control file exported by the specified file system, wherein the control file is used to indicate the PCIe device resource information.

Optionally, the management module includes: a scanning unit configured to perform a write operation on the PCIe bus according to the linked list and a PCIe device file exported by the specified file system, to perform dynamic enumeration scanning on the PCIe bus The obtaining unit is configured to perform a read operation on the PCIe according to the PCIe device control file that is exported according to the linked list and the specified file system, and is used to acquire resource information of the PCIe device.

Optionally, before the managing the dynamic scanning of the PCIe device and the PCIe bus according to the linked list and the PCIe device file exported by the specified file system, the device further includes: an establishing module, configured to be in the specified file system And performing a initialization, and establishing a control file under the specified file system, wherein the control file is provided with a first function and a second function, where the first function is used to indicate how to operate the control file to complete the a dynamic enumeration scan of the PCIe bus, the second function is for indicating a start position of performing an enumeration scan; and the scan module is configured to perform dynamic on the PCIe device bus according to the first function and the second function Enumeration scan.

Optionally, the execution module is further configured to perform an enumeration scan on the entire PCIe device tree from the PCIe controller according to a depth-first algorithm.

Optionally, before performing the enumeration scan operation on the PCIe device tree, the device further includes: a shutdown module, configured to disable the enumeration scan operation function carried by itself, triggering the PCIe device according to the depth priority algorithm The tree performs an enumeration scan operation.

According to the embodiment of the present invention, when the PCIe device tree is subjected to the enumeration scan, the scanned PCEe device generates a corresponding structure according to the location of the PCEe device in the PCIe bus, and adds the structure to the linked list. The dynamic enumeration scan management of the PCIe device and the PCIe bus is further performed according to the linked list and the PCIe device file exported by the specified file system. The invention realizes the dynamic scanning of PCIe, and solves the problem that the initial scanning of PCIe in the related art is static, and achieves the effect of improving the debugging efficiency of the system.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a flowchart of a method for managing a PCIe device and a PCIe bus according to an embodiment of the present invention;

2 is a structural block diagram of a management apparatus of a PCIe device and a PCIe bus according to an embodiment of the present invention;

3 is a block diagram 1 of an optional structure of a management device for a PCIe device and a PCIe bus according to an embodiment of the present invention;

4 is a block diagram 2 of an optional structure of a management device for a PCIe device and a PCIe bus according to an embodiment of the present invention;

5 is a block diagram 3 of an optional structure of a management device for a PCIe device and a PCIe bus according to an embodiment of the present invention;

6 is a flow chart of a dynamic enumeration scan PCIe device and management method in accordance with an alternative embodiment of the present invention.

detailed description

It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments.

The steps illustrated in the flowchart of the figures may be performed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, may differ from this The steps shown are performed in the order shown or described.

This embodiment provides a PCIe device and a PCIe bus management method. FIG. 1 is a flowchart of a PCIe device and a PCIe bus management method according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following steps:

Step S102: Perform an enumeration scan operation on the PCIe device tree, and generate a structure corresponding to the scanned PCEe device according to the location of the PCIe device in the PCIe bus;

Step S104: adding the structure to the linked list of the PCIe device;

Step S106: Perform dynamic enumeration scan management on the PCIe device and the PCIe bus according to the linked list and the PCIe device file exported by the specified file system;

The file is used to indicate PCIe device resource information.

In this embodiment, when performing an enumeration scan on the PCIe device tree, the scanned PCEe device generates a corresponding structure according to the location of the PCEe device in the PCIe bus, and adds the structure to the linked list; Management of dynamic enumeration scans of PCIe devices and PCIe buses based on the linked list and PCIe device files exported by the specified file system. The dynamic scanning of the PCIe is implemented by the embodiment, and the initialization scan of the PCIe in the related art is solved statically, and the effect of improving the debugging efficiency of the system is achieved.

It should be noted that, for the specified file system involved in the foregoing embodiment, in the optional implementation manner of this embodiment, the sys file system may be used, and the embodiment will be correspondingly described below through the sys file system;

Based on the above sys file system, in an optional implementation manner of this embodiment, the manner of managing the dynamic scanning of the PCIe device and the PCIe bus according to the PCIe device control file exported by the linked list and the specified file system in the foregoing step S106 may be as follows: Way to achieve:

Manner 1: Perform a write operation on the PCIe bus according to the linked list and the PCIe device control file exported by the specified file system, for performing dynamic enumeration scan on the PCIe bus;

Method 2: Perform a read operation on the PCIe device according to the linked list and the PCIe device control file exported by the specified file system, and obtain the resource information of the PCIe device.

That is to say, through the above manners 1 and 2, the control file write operation under the sys file system can complete the dynamic enumeration scan of the PCIe bus, and the PCIe device file can be obtained when the PCIe device file under the sys file system is read. Resource information.

Before the management of the dynamic scanning of the PCIe device and the PCIe bus by the PCIe device file exported by the linked file and the specified file system in the step S106, the method in this embodiment may further include:

Step S11: When the specified file system is initialized, and the control file is established under the specified file system, wherein the control file is provided with a first function and a second function, and the first function is used to indicate how to operate the control file to complete the PCIe bus. Dynamic enumeration scan, the second function is used to indicate the start position of the execution of the enumeration scan;

Step S12: Perform a dynamic enumeration scan on the PCIe device bus according to the first function and the second function.

Through the above steps S11 and S12, the PCIe device bus is configured to perform dynamic enumeration scanning by setting the first function and the second function in the control file. In the optional implementation manner of this embodiment, the first function may be a show. Function, the second function can be a store function, that is, when reading the control file, the system will call the show function to display some strings, which are used to explain how to operate the control file to complete the dynamic enumeration scan of the PCIe device tree; The implementation of the show function is a kind of illustrative use, can not afford the function; when writing the control file, the system will call the store function. In this function, you need to parse the written string, and determine where to start the enumeration scan in the PCIe device tree based on the parsed content; after parsing the information, the store function will call the enumeration scan function to specify the device tree. The port performs an enumeration scan. If the entire PCIe device tree needs to be scanned, the location information of the PCIe controller is written into the control file.

For the manner of performing the enumeration scan operation on the PCIe device tree involved in this embodiment, optionally, in the embodiment, the entire PCIe device tree is enumerated and scanned from the PCIe controller according to the depth-first algorithm.

Before performing the enumeration scan, in this embodiment, the enumeration scan operation function carried by the self needs to be turned off, and the operation of enumerating the PCIe device tree according to the depth-first algorithm is triggered. In other words, the initialization of the PCIe device is not required by the built-in enumeration scanning process.

In the embodiment, a management device for the PCIe device and the PCIe bus is provided, and the device is used to implement the foregoing embodiments and preferred embodiments, and details are not described herein. As used below, the term "module" "unit" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

2 is a structural block diagram of a PCIe device and a PCIe bus management device according to an embodiment of the present invention, as shown in FIG. 2 As shown, the apparatus includes an execution module 22 configured to perform an enumerated scan operation on the latest peripheral component expansion interface PCIe device tree, and generate a structure corresponding to the scanned PCEe device according to the location of the PCIe device in the PCIe bus. The adding module 24 is coupled to the execution module 22 and configured to add the structure to the linked list of the PCIe device. The management module 26 is coupled to the adding module 24 and configured to be a PCIe device file pair exported according to the linked list and the specified file system. The PCIe device and the PCIe bus perform dynamic enumeration scan management, wherein files are used to indicate PCIe device resource information.

Optionally, the execution module is further configured to perform an enumeration scan of the entire PCIe device tree from the PCIe controller according to the depth first algorithm.

FIG. 3 is a block diagram of an optional structure of a PCIe device and a PCIe bus management device according to an embodiment of the present invention. As shown in FIG. 3, the management module 26 includes: a scanning unit 32 configured to export PCIe according to a linked list and a specified file system. The device file performs a write operation on the PCIe device file, and is used to perform a dynamic enumeration scan on the PCIe bus; the obtaining unit 34 is configured to perform a read operation on the PCIe device file according to the linked list and the PCIe device file information exported by the specified file system, Obtain the resource information of the PCIe device.

4 is a block diagram 2 of an optional structure of a PCIe device and a PCIe bus management device according to an embodiment of the present invention. As shown in FIG. 4, a PCIe device and a PCIe bus are dynamically scanned according to a PCIe device file exported according to a linked list and a specified file system. Before the management, the device further includes: an establishing module 42 coupled to the adding module 24, configured to establish a control file under the specified file system when the specified file system is initialized, wherein the control file is provided with the first function and a second function, the first function is used to indicate how to operate the control file to complete the dynamic enumeration scan of the PCIe bus, the second function is used to indicate the start position of the enumeration scan, and the scan module 44 is coupled to the setup module 42 to set A dynamic enumeration scan is performed on the PCIe device bus in accordance with the first function and the second function.

5 is a block diagram 3 of an optional structure of a management device for a PCIe device and a PCIe bus according to an embodiment of the present invention. As shown in FIG. 5, before performing an enumeration scan operation on a PCIe device tree, the device further includes: a shutdown module 52, The method is coupled to the execution module 22, and is configured to disable the enumeration scan operation function carried by the self-execution module, and trigger an operation of enumerating and scanning the PCIe device tree according to the depth-first algorithm.

The present invention is exemplified in the following with reference to an optional embodiment of the embodiments of the present invention;

This alternative embodiment provides a method for dynamically enumerating scans and managing PCIe devices. In this alternative embodiment, the Linux operating system is taken as an example. After the Linux operating system is started, the user can rescan the entire PCIe as needed. The device tree allocates resources such as bus number and storage space for devices on each PCIe bus tree. The optional embodiment can also perform recursive scanning from a certain PCIe port and allocate resources for devices under the port.

This alternative embodiment can be implemented from the following aspects:

(1) Maintenance and representation of PCIe equipment

The implementation of the data structure that comes with the Linux operating system has given a lot of reference. In the implementation process of the optional embodiment, a scanned device is still used to represent a scanned device, and each device structure group is organized by using a linked list method, thereby facilitating the implementation of the subsequent scanning algorithm. The completion of the dynamic scanning function.

(2) Enumeration scan using traditional DFS algorithm

The so-called enumeration scan PCIe device tree refers to enumerating the entire PCIe device tree from the PCIe controller; when a device is found, it generates a device structure for it, and according to the location of the PCIe bus where the device is located, the device structure The body is added to the PCIe device list.

The tree structure traversal algorithm is roughly divided into Breadth-First-Search (abbreviated as BFS) and Depth First Search (DFS). In this alternative embodiment, a depth-first algorithm is used for the enumeration scan of the PCIe device tree. The algorithm is based on two aspects. First, the DFS algorithm is used to complete the enumeration scan of the PCIe device tree to help understand the topology of the PCIe. Second, the enumeration scan implementation that comes with Linux can be used as a reference for this alternative embodiment. And draw on.

(3) Management of dynamic enumeration scan

In order to improve the efficiency of debugging and locating faults, and implement dynamic enumeration scanning of the PCIe device tree, the optional embodiment manages the PCIe bus and devices through files exported under the sys file system; and writes control files to the sys file system. The dynamic enumeration scan of the PCIe bus can be completed; and the information of the PCIe device can be obtained when the PCIe device file under the sys file system is read.

The present optional embodiment will be described in detail below with reference to the accompanying drawings;

FIG. 6 is a flowchart of a dynamic enumeration scanning PCIe device and a management method according to an alternative embodiment of the present invention. As shown in FIG. 6, the steps of the method include:

Step S602: Start executing the Linux kernel;

Step S604: Initializing the Linux kernel;

Step S606: dynamic enumeration scan initialization;

Step S608: Perform a dynamic enumeration scan by using a sys file interface operation;

Step S610: Start a dynamic enumeration scan;

Step S612: The dynamic enumeration scan ends.

(1) Data structure and interface design:

To save and represent the PCIe device that has been enumerated for scanning, you need to define a data structure in the Linux system. Describe the specific equipment. Such a structure exists in the Linux kernel itself, but in order to be functionally independent, the optional embodiment re-implements the PCIe device structure.

In addition to the basic information of the device, such as busID, devID, vendorID, functionID, and the base address of various storage resources, the structure also includes the pointers needed to maintain the PCIe device tree list, and manages the sys file data structure.

(2) Depth-first traversal implementation of the PCIe device tree:

A: Turn off the enumeration that comes with the Linux operating system and enable dynamic enumeration.

A processor system begins with firmware and starts booting the Linux kernel with Firmware. After the boot process, the system will jump to the first head.s file in Linux, and then jump to the start_kernel function of the ./init/main.c file from the head.s file. Start the PCIe initialization journey from here.

The firmware used by different systems is also different. The x86 system uses the BIOS, while the Powerpc system uses U-Boot. Enumeration initialization of PCIe devices is usually done in the Firmware phase, where each device in the PCIe device tree is assigned resources such as busID, devID, functionID, and so on.

In the Linux kernel phase, different PCIe initialization enumeration scan operations are performed according to different options at compile time. When the CONFIG_PCI_BOIS option is configured during Linux kernel compilation, the PCIe initialization process in the Linux kernel is simply based on the result of the firmware enumeration to establish the PCIe-related data structure of the kernel, adding the maintenance of the PCIe device to the device management model. This process does not allocate resources such as busID, devID, functionID, and storage space for PCIe devices. Conversely, if the kernel is configured with the CONFIG_PCI_DIRECT option at compile time, the Linux system will re-enumerate the devices on the PCIe bus and allocate the required resources to them.

In the method of implementing the optional embodiment, the initialization process of the PCIe device is not required in the Linux kernel, so the CONFIG_PCI_DIRECT option should be closed when compiling the kernel. It also ensures that the dynamic management enumeration process implemented by this alternative embodiment is completed before the Linux kernel initializes the PCIe device tree. Therefore, the implementation in this alternative embodiment is performed by placing the initialization interface function start_pcie of the dynamic enumeration scan at the beginning of the do_basic_setup function.

B: Implementation of dynamic enumeration scan function

The dynamic enumeration scan is implemented by the function pci_scan_device(struct bsp_pci_device*parent, int domain, int bus, int device, int func). This function uses the DFB algorithm to recursively scan and allocate resources to the PCIe device tree under the parent node parent. After discovering a new PCIe device, the device is first allocated corresponding resources, and then a struct bsp_pci_device structure is generated to save the device information, and the structure is added to the linked list of the PCIe device; when the function is executed, All PCIe devices under parent will be initialized, and the generated device structure will be added to the PCIe device list. This will be convenient. Management of PCIe devices.

(3) sys file interface supporting dynamic enumeration scanning:

A: Define the files of the dynamic enumeration scan interface and the corresponding operations

In order to complete the dynamic enumeration scan by operating the files under the sys file system, the system needs to establish the corresponding directory and control file under /sys, and define the show and store operations for the control file.

The initialization interface function start_pcie of the dynamic enumeration scan is the most suitable place to implement PCIe sys file initialization. The sysfs_create_file function provided by the Linux kernel is called in start_pcie to establish the PCIe dynamic enumeration scan control file pci_control.

In order to actually implement dynamic scanning of the PCIe device tree through the pci_control file, the show and store functions of this file need to be implemented. When reading the pci_control file, the system will call the show function to display some strings. These strings are used to illustrate how to manipulate the pci_control file to perform a dynamic enumeration scan of the PCIe device tree. The implementation of the show function is essentially a declarative use and does not function. When the pci_control file is written, the store function is called. In this function, the written string needs to be parsed, and based on the parsed content, it is determined at which position in the PCIe device tree the enumeration scan needs to be started. After parsing this information, the store function will call the above mentioned pci_scan_device function to perform an enumeration scan on the specified port of the device tree. If the entire PCIe device tree needs to be scanned, the location information of the PCIe controller is written into the pci_control file.

B: Implement PCIe device files and corresponding operations:

As before, when the dynamic enumeration scan function pci_scan_device is called to scan a PCIe device, the system assigns a device structure struct bsp_pci_device to it, and uses this structure to record and represent a PCIe device. In order to display and control the PCIe device, the scanned device needs to be exported to the /sys file system during scanning, and a device file ww:xx.yy.zz is generated under the file system. (Wh, ww indicates the domain where the device is located, xx is the bus number of the device, yy is the device number, and zz is the function number). When the file is read/written, the Linux kernel will apply the appropriate action to the PCIe device.

When the device file ww:xx.yy.zz is read, the system calls the show function of the device file. This function is implemented in this alternative embodiment as the operation of printing the corresponding PCIe device configuration space. When writing a value to a device file, Linux will call the store function implemented in the patent to complete the write operation of the PCIe device's configuration space.

In this embodiment, the PCIe dynamic enumeration scan management function is directly compiled into the kernel. Therefore, after the Linux system is powered on, the function is completely initialized. The initialization mainly includes two aspects: one is to enumerate and scan the PCIe device tree. And establishing a corresponding data structure for the enumerated PCIe device to form a linked list of device trees; second, establishing a display and management interface of the PCIe device in the sys file system according to the enumerated scan result. The method of the alternative embodiment can improve the efficiency of PCIe debugging and reduce the complexity of PCIe debugging.

The above is only an alternative embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

In the present invention, when performing an enumeration scan on the PCIe device tree, the scanned PCEe device generates a corresponding structure according to the location of the PCEe device in the PCIe bus, and adds the structure to the linked list; Management of dynamic enumeration scans of PCIe devices and PCIe buses based on the linked list and PCIe device files exported by the specified file system. The invention realizes the dynamic scanning of PCIe, and solves the problem that the initial scanning of PCIe in the related art is static, and achieves the effect of improving the debugging efficiency of the system.

Claims

A new peripheral component expansion interface PCIe device and PCIe bus management method, including:

Performing an enumeration scan operation on the latest peripheral component expansion interface PCIe device tree, and generating a structure corresponding to the scanned PCEe device according to the location of the PCIe device in the PCIe bus;

Adding the structure to a linked list of the PCIe device;

And managing the dynamic enumeration scan of the PCIe device and the PCIe bus according to the linked list and the PCIe device control file exported by the specified file system, where the control file is used to indicate the PCIe device resource information.
The method of claim 1, wherein the managing the dynamic scanning of the PCIe device and the PCIe bus according to the linked list and the PCIe device control file exported by the specified file system comprises:

Performing a write operation on the PCIe bus according to the linked list and a PCIe device file exported by the specified file system, for performing dynamic enumeration scan on the PCIe bus;

And performing a read operation on the PCIe device according to the linked list and the PCIe device control file that is specified by the specified file system, and configured to acquire resource information of the PCIe device.
The method of claim 1, wherein before the managing the dynamic scanning of the PCIe device and the PCIe bus according to the linked list and the PCIe device control file exported by the specified file system, the method comprises:

And when the specified file system is initialized, and the control file is established under the specified file system, wherein the control file is provided with a first function and a second function, where the first function is used to indicate how to operate The control file completes a dynamic enumeration scan of the PCIe bus, and the second function is used to indicate a start position of performing an enumeration scan;

Performing a dynamic enumeration scan on the PCIe device bus in accordance with the first function and the second function.
The method of claim 1 wherein performing an enumeration scan operation on the PCIe device tree comprises:

An enumeration scan of the entire PCIe device tree is started from the PCIe controller according to a depth-first algorithm.
The method of claim 4 wherein prior to performing an enumeration scan operation on the PCIe device tree comprises:

The enumeration scan operation function carried by the user is turned off, and the operation of enumerating the PCIe device tree according to the depth-first algorithm is triggered.
A new peripheral component expansion interface PCIe device and PCIe bus management device, including:

An execution module, configured to perform an enumeration scan operation on the latest peripheral component expansion interface PCIe device tree, and generate a structure corresponding to the scanned PCEe device according to the location of the PCIe device in the PCIe bus;

Adding a module, configured to add the structure to a linked list of the PCIe device;

a management module, configured to perform dynamic enumeration scan management on the PCIe device and the PCIe bus according to the linked list and the PCIe device control file exported by the specified file system, where the control file is used to indicate the PCIe device resource information .
The apparatus of claim 6 wherein said management module comprises:

a scanning unit, configured to perform a write operation on the PCIe bus according to the linked list and a PCIe device file exported by the specified file system, to perform dynamic enumeration scanning on the PCIe bus;

The obtaining unit is configured to perform a read operation on the PCIe according to the PCIe device control file that is exported according to the linked list and the specified file system, and is used to acquire resource information of the PCIe device.
The apparatus of claim 6, wherein the apparatus further comprises: before managing the dynamic scanning of the PCIe device and the PCIe bus according to the linked list and the PCIe device file exported by the specified file system, the apparatus further comprising:

Establishing a module, configured to establish a control file under the specified file system when the specified file system is initialized, wherein the control file is provided with a first function and a second function, where the first function is used Performing a dynamic enumeration scan of the PCIe bus for indicating how to operate the control file, the second function for indicating a start position of performing an enumeration scan;

A scanning module is configured to perform a dynamic enumeration scan on the PCIe device bus in accordance with the first function and the second function.
The apparatus according to claim 6, wherein

The execution module is further configured to perform an enumeration scan on the entire PCIe device tree from the PCIe controller according to a depth-first algorithm.
The apparatus of claim 9, wherein before performing the enumeration scan operation on the PCIe device tree, the apparatus further comprises:

The module is closed, and is configured to disable the enumeration scan operation function carried by the module, and trigger an enumeration scan operation on the PCIe device tree according to the depth-first algorithm.